JP5041558B2 - Bottle coating chamber - Google Patents

Description

  The present invention is a coating chamber for forming a coating film on the outer surface of a glass bottle, and particularly suitable for coating a returnable bottle that is used repeatedly (a hot-end coating applied just before being sent to a slow cooling furnace). About.

Returnable bottles are environmentally friendly in that they can be reused many times. However, since returnable bottles are thick and heavy to prevent breakage, their evaluation from the viewpoint of CO ₂ emission during transportation is low.
In recent environmentally-friendly societies, weight reduction of bottles is essential, and there is a great demand for weight reduction in returnable bottles.

If the wall thickness of the returnable bottle is reduced and the weight is reduced, the strength of the bottle becomes a problem. The strength of the glass bottle is sufficiently large at the beginning of molding, but it is extremely lowered when the outer surface is damaged. In order to prevent the outer surface of the bottle from being damaged, a coating that forms a metal oxide film such as SnO ₂ or TiO _{2 on the} outer surface of the bottle is performed at the hot end before the bottle in the glass bottle forming process enters the annealing furnace. Is called.

In the case of a returnable bottle, alkaline cleaning is performed each time it is collected and reused. In the alkali cleaning, if even a part of the coating film is peeled off, the part is easily scratched, and the aesthetics of the bottle is also lost.
In order to form a film having a high alkali resistance, it is necessary to spray the coating material gas on the outer peripheral surface of the bottle with a large pressure.
In addition, when the material gas is blown onto the bottle with a large pressure, the bottle falls or slips in the chamber, causing bottle clogging in the chamber and causing a problem in the bottle forming line.
An object of the present invention is to provide a coating chamber that can form a film having a high alkali resistance and in which the bottle does not fall within the chamber.
The chamber of Patent Document 1 has a material gas blowout port disposed below the center of gravity of the bottle, and combines the total area of the blowout port and the air volume within a predetermined range.

Japanese Patent Laid-Open No. 11-100037

  The present inventor determined the spraying gas pressure necessary to form a sufficient alkali-resistant coating and the amount of bottle slip in the chamber so as not to cause clogging in the chamber by repeated experiments. The results are shown in Table 1.

  In Table 1, the amount of slip is the amount of movement when the bottle receives blown gas in the chamber passage for 30 seconds. Amount.

  In Table 1, the “target value” of the gas pressure (spraying gas pressure) is a value where the alkali resistance of the coating film to be formed (time to withstand 4% by weight sodium hydroxide aqueous solution at 90 ° C.) is 3 hours or more. "Value" is a value for which alkali resistance is 2 to 3 hours. In both cases, the average and minimum values must be greater than or equal to the values in the table.

In order to verify the chamber of Patent Document 1, the present inventor provided the outlets 25 at the lower portions on both sides of the bottle passage as shown in FIG. 8, and changed the height h ₀ of the outlets in various ways. The amount of movement (30 seconds) and the pressure of the sprayed gas were measured.
A bottle having a height of about 290 mm, a center of gravity position of about 112 mm, an outer diameter of about 70 mm, and a weight of about 400 g was used.
Moreover, the frequency of the blower which supplies gas (air) to the right and left blowing chambers was performed at 85 Hz (air volume: about 8 m ³ / min).
Table 2 shows the height of the air outlet and the area of the air outlet (total on both sides).

The measurement result of the bottle slip amount in this experiment is shown in FIG. In the figure, the square points are when the top plate 6 is not provided, and the round points are when the top plate 6 is installed.
If the height h ₀ of the air outlet approaches the gravity center position, suddenly slip amount increases. It was also confirmed that the amount of slip was smaller when the top plate was not provided.

The pressure of the blowing gas in this experiment was measured with the bottle model 8 shown in FIG. The bottle model 8 is made of metal, has four measurement holes 81 (diameter 5 mm), and a pressure sensor is provided in each measurement hole. The measurement holes 81 are provided in the neck, shoulder, trunk, and skirt sequentially from top to bottom.
The body part is a part that accommodates most of the internal capacity and the outer peripheral surface is formed almost vertically, and the neck part is on the body part, and the outer peripheral surface is almost vertically or gradually reduced in diameter toward the top. The part and shoulder are between the torso and neck, the diameter is reduced upward, the degree of diameter reduction is greater than the neck, and the hem is gradually reduced between the torso and bottom. It is.

  The gas pressure received by the bottle model depends on the orientation of the measurement hole in the bottle passage of the chamber. Therefore, the position of the bottle model was sequentially changed so that the direction of the measurement hole shown in FIG. 11 was A, B, and C, and the average value and the minimum value of the pressure were measured at each point of the neck or skirt. . The same applies to the pressure measurement described later.

  Table 3 shows the gas pressure measurement results in this experiment (without the top plate). In the table, ◯ indicates the target value or more, Δ indicates the limit value or more and less than the target value, and X indicates the limit value or less.

As shown in Table 3, the gas pressure sprayed on the neck and shoulder of the bottle is less than the limit value, and good alkali resistance cannot be expected. Also in the barrel, good alkali resistance to be higher than the height h ₀ Gavin center of gravity of the air outlet can not be expected.
Therefore, it was confirmed that good alkali resistance cannot be obtained if the outlet is provided only below the center of gravity of the bottle.

  It is an object of the present invention to form a coating film having good alkali resistance on all the necks or hems of a bottle and to prevent bottle clogging in the chamber.

[Claim 1]
The present invention comprises blowing chambers on both sides across the conveyor for transferring the bottles, and the horizontally long first, second and third outlets are formed on the conveyor-side surface of each blowing chamber,
The first air outlet has a lower end height within ± 5 mm at the bottom of the bottle, a width of 12 to 33 mm,
When the height of the bottle is BH,
The second air outlet has a center height of the lowest part of the bottle + (0.43 to 0.53) BH, and a width of 3 to 12 mm.
The third outlet has a center height of the lowest part of the bottle + (0.66 to 0.76) BH, and a width of 3 to 12 mm.
It is a coating chamber of the bottle characterized by being.

  The height of the lower end of the first air outlet is preferably the same position as the lowest part of the bottle, but there may be an error within ± 5 mm. The width is preferably 12 to 33 mm. If the width is less than 12 mm, the gas pressure in the bottle body portion becomes small, and if it exceeds 33 mm, the amount of bottle slip may be increased. A more preferable range of the width is 12 to 18 mm.

  The center height of the second outlet is preferably the lowest part of the bottle + (0.43 to 0.53) BH, and if it is less than 0.43 BH and exceeds 0.53 BH, the gas pressure at the bottle shoulder is There is a risk of becoming smaller. A more preferable range is the lowest bottle portion + (0.45-0.51) BH. The width is preferably 3 to 12 mm, and if it is less than 3 mm, the gas pressure at the bottle shoulder is reduced, and if it exceeds 12 mm, the amount of bottle slip may be increased. A more preferable range is 3 to 7 mm.

  The center height of the third outlet is preferably the lowest part of the bottle + (0.66 to 0.76) BH. If it is less than 0.66 BH, the gas pressure at the neck of the bottle will decrease, and if it exceeds 0.76 BH, the bottle shoulder There is a possibility that the gas pressure of the part becomes small. A more preferred range is the lowest part of the bottle + (0.68 to 0.74) BH. The width is preferably 3 to 12 mm, and if it is less than 3 mm, the gas pressure at the bottle shoulder and neck becomes small, and if it exceeds 12 mm, the amount of bottle slip may increase. A more preferable range is 3 to 7 mm.

When the first to third outlets are set as described in claim 1, the gas pressure in each part of the bottle can be easily set to the limit value or the target value and the slip amount of the bottle can be set to the target value or less. .
Further, when the first to third outlets are set in the further preferable range, the gas pressure in each part of the bottle can be easily set to the target value or more and the slip amount of the bottle can be set to the target value or less.

[Claim 2]
Moreover, this invention is a coating chamber of Claim 1 whose length of said 1st thru | or 3rd blower outlet is 230-330 mm.

  The length of the air outlet is preferably 230 to 330 mm, and if it is less than 230 mm, the coating film thickness becomes insufficient, and if it exceeds 330 mm, the slipping amount of the bottle may increase. A more preferable range is 260 to 300 mm.

[Claim 3]
Moreover, this invention is a coating chamber of Claim 1 or 2 whose width | variety of the bottle channel | path formed in the surface at the side of the conveyor of each said blowing chamber is the largest diameter (phi) + (30-80) mm of a bottle.

  The width of the bottle passage in the chamber is preferably the maximum bottle diameter φ + (30 to 80) mm. If it is narrower than this range, the amount of bottle slip increases, and if it is wider, the gas pressure at each part of the bottle may be reduced. A more preferable range is the maximum bottle diameter φ + (50 to 70) mm.

[Claim 4]
Moreover, this invention is a coating chamber in any one of Claims 1-4 which provided the upper suction chamber above the said bottle channel | path.

  Providing the upper suction chamber above the bottle passage in the chamber corresponds to the case where the top plate of FIG. 9 is not provided, and can reduce the amount of bottle slip.

[Claim 5]
Further, the present invention is the coating chamber according to claim 4, wherein a top plate is provided between the bottle passage and the upper suction chamber, and a gap is formed on both sides in the width direction of the top plate.

  If comprised in this way, since coating raw material gas will flow toward an outer top plate clearance gap from a bottle opening part, a coating agent will not adhere to a bottle opening part inner surface. When the width of the gap is about 15 to 25 mm on one side, the influence on the amount of bottle slip is small, which is preferable. More preferably, it is 17-23 mm.

[Claim 6]
Moreover, this invention is a coating chamber of Claim 5 whose width direction longitudinal cross-sectional shape of the said top plate is V shape.

  By making the vertical cross-sectional shape in the width direction of the top plate V-shaped, the amount of slipping of the bottle is less than in the case of the flat plate shape. The V-shaped angle is preferably 60 to 120 °.

  The above findings were confirmed by experiments conducted repeatedly while changing numerical values of various elements.

  The bottle coating chamber of the present invention forms a coating film with high alkali resistance on the entire outer surface of the bottle from the neck to the bottom of the bottle, and the alkali cleaning is performed each time the coating film of the bottle used repeatedly is collected. As a result, there is almost no possibility that even a part will be peeled off, and there is no possibility of bottle clogging in the chamber during coating.

2 is a side view of the chamber 1. FIG. 2 is a longitudinal sectional view of the chamber 1 in the length direction. FIG. 2 is a longitudinal sectional view of the chamber 1 in the width direction. FIG. It is principal part explanatory drawing of the chamber which provided the top plate. It is principal part explanatory drawing of the chamber which provided the top plate. It is explanatory drawing of the relationship between a blower frequency and the amount of bottle slips. It is explanatory drawing of the relationship between the width | variety of a top plate, and the amount of bottle slips. It is explanatory drawing of the experiment which provided the blower outlet 25 in the lower part. It is explanatory drawing of the relationship between the blower outlet height h0 and the amount of bottle slips in FIG. 3 is a front view of a bottle model 8. FIG. It is explanatory drawing of direction of the measurement hole of a bottle model.

1 to 5 relate to the chamber of the embodiment.
The chamber 1 is provided slightly upstream (hot end) at the inlet of the slow cooling furnace in the glass bottle forming line. Blowing chambers 2 are provided on both sides of a conveyor 7 that conveys the molded glass bottles, a bottle passage 5 is provided between them, and an upper suction chamber 3 is provided above them. Further, a rear suction chamber 4 for collecting the coating material gas swept away from the bottle is also provided at the rear. Further, exhaust chambers 9 are provided on both sides of the gondola 7 at the inlet side and outlet side end portions of the blowout chamber 2 and the rear suction chamber 4 so that the coating material gas does not flow outside. A blowout duct 24 is connected to the blowout chamber 2 and a material gas is supplied by a blower (not shown). Suction ducts 31 and 41 are connected to the upper suction chamber 3 and the rear suction chamber 4, and a surplus material gas is sucked in by a blower (not shown). The sucked material gas is recycled.
In some cases, a top plate 6 can be provided between the bottle passage 5 and the upper suction chamber 3 (FIGS. 4 and 5).

The chamber 1 performs hot-end coating on a glass bottle having a height (BH) of 290 mm, an outer diameter of 70 mm, and a mass of 400 g.
As shown in FIGS. 2 and 4, horizontally long first air outlets 21, second air outlets 22, and third air outlets 23 are formed on the conveyor-side surface of the air outlet chambers 2 on both sides. The length L of each outlet is 280 mm. The width w ₁ of the first air outlet 21 is 15 mm, the width w ₂ of the second air outlet 22 is 5 mm, and the width w ₃ of the _third air outlet 23 is 5 mm. The height of the lower end of the first air outlet 21 is equal to the height of 10 minimum unit bottle, 140mm (0.48BH) position higher than the height h ₂ Wabin lowest part of the center of the second air outlet 22, The height h _{3 of the third} outlet 23 is 206 mm (0.71 BH) higher than the lowest part of the bottle.
The width W of the bottle passage 5 is 130 mm, and the bottle body diameter φ + 60 mm.

The first air outlet 21 is located at the bottom of the bottle or under the body, the second air outlet 22 is located at the shoulder of the bottle, and the third air outlet 23 is located at the neck of the bottle.
In order to verify the operational effects of the first to third outlets in the present invention, apart from these, a barrel outlet (width 5 mm, length 280 mm) is provided at a position near the center of the bottle barrel. It was measured how the gas pressure acting on each part of the bottle changes depending on the combination. The results are shown in Table 4. The measurement was performed in the same manner as described above using the bottle model shown in FIG. The frequency of the blowout blower was 85 Hz.

In Table 4, “1” indicates a first outlet, “2” indicates a second outlet, “3” indicates a third outlet, and “body” indicates a trunk outlet. “Pressure” is the pressure applied to the “neck”, “shoulder”, “body”, and “hem” of the bottle. “○” is the target value or more, “△” is the limit value or more, and “×” is the target value. Indicates less than the limit value.
The slip amount is a slip amount for 30 seconds, and “◯” indicates a target value or less.
As shown in Table 4, the combinations of the first, second, and third outlets of the present invention are all “◯” except that the shoulder pressure is “△”, but all other combinations are 2 or more “x” is included, and the superiority of the present invention is clarified.

  Next, the frequency of the blower blower in the chamber 1 of the example was changed, and the gas pressure acting on each part of the bottle and the bottle slip amount were verified. The results are shown in Table 5.

As shown in Table 5, when the blower frequency is 95 to 110 Hz, the gas pressure and bottle slip amount acting on each part of the bottle are all “◯”.
Therefore, it is possible to perform a suitable coating (a coating that can form a coating film having a high alkali resistance without clogging in the chamber) in a wide range of a blower frequency of 95 to 110 Hz. This means that suitable coating can be performed easily and stably.

The appropriate air volume of the gas blown out from the air outlet varies depending on various factors such as the size of the air outlet, the size of the bottle passage, and the size of the bottle. Since suitable coating can be performed with a wide range of blower frequencies (air flow), it is easy to implement an appropriate air flow.
Incidentally, the total air volume of the present embodiment is about 9 m ³ / min at a blower frequency of 95 Hz and about 10 m ³ / min at 110 Hz.

A top plate 6 as shown in FIGS. 4 and 5 was provided in the chamber of this example, and the change in the amount of slip of the bottle was examined by changing the width of the top plate (the width g of the gap 61 at both ends). The result is shown in FIG. FIG. 4 shows a case where the top plate has a flat plate shape, and FIG. 5 shows a case where the cross-sectional shape in the width direction of the top plate is V-shaped. In FIG. 7, circle points are when the top plate is flat, and square points are when the top plate is V-shaped (when the V-shaped angle θ = 90 °).
By providing the top plate, the coating film can be prevented from adhering to the inside of the bottle. When the top plate is provided, if the width g of the gap 61 is set to 17 to 25 mm, the increase amount of the bottle slip amount from the case where the top plate is not provided can be suppressed to about 5 mm or less.
Further, as shown in FIG. 5, if the vertical cross-sectional shape of the top plate 6 is V-shaped, the amount of slippage of the bottle is less than that of the flat plate shape of FIG. It becomes the same level. The V-shaped angle θ is suitably 60 to 120 °.

Then, changed to 10mm only the width w ₂ of the second outlet of the above embodiment from 5 mm, others in the same chamber as the above-described embodiment, by changing the frequency of the air blower, gas pressure and bottle acting on bottles each unit The amount of slip was measured. The results are shown in Table 6.

In the case of this example, the range of the blower frequency in which all are “◯” was 95 to 105 Hz, which was the same as the example. However, the bottle slip amount was “Δ” at a blower frequency of 110 Hz as compared with the previous example. FIG. 6 shows the relationship between the blower frequency and the amount of bottle slip, with a round point when the width w ₂ of the second outlet is 5 mm and a square point when the width w ₂ is 10 mm. It was confirmed that the slip amount was smaller when the width w ₂ of the second outlet was 5 mm.

  The chamber of the present invention is particularly suitable for use in a bottle having a height of about 260 to 310 mm, but is not limited thereto. Further, the present invention is not limited to round bottles, and can be applied to deformed bottles such as square bottles.

DESCRIPTION OF SYMBOLS 1 Chamber 2 Outlet chamber 21 1st outlet 22 Second outlet 23 Third outlet 24 Outlet duct 25 Outlet 3 Upper suction chamber 31 Suction duct 4 Back suction chamber 41 Suction duct 5 Bottle passage 6 Top plate 61 Crevice 7 Conveyor 8 Bottle model 81 Measuring hole 9 Exhaust chamber 10 Bottle

Claims (6)

Equipped with blowing chambers on both sides across the conveyor for transferring the bottles, horizontally long first, second and third outlets are formed on the conveyor side surface of each blowing chamber,
The first air outlet has a lower end height within ± 5 mm at the bottom of the bottle, a width of 12 to 33 mm,
When the height of the bottle is BH,
The second air outlet has a center height of the lowest part of the bottle + (0.43 to 0.53) BH, and a width of 3 to 12 mm.
The third outlet has a center height of the lowest part of the bottle + (0.66 to 0.76) BH, and a width of 3 to 12 mm.
A bottle coating chamber, characterized in that The coating chamber according to claim 1, wherein the first to third outlets have a length of 230 to 330 mm. The coating chamber according to claim 1 or 2, wherein a width of a bottle passage formed on a conveyor side surface of each of the blowout chambers is a maximum diameter φ + (30 to 80) mm of the bottle. The coating chamber according to claim 1, wherein an upper suction chamber is provided above the bottle passage. The coating chamber according to claim 4, wherein a top plate is provided between the bottle passage and the upper suction chamber, and a gap is formed on both sides in the width direction of the top plate. The coating chamber according to claim 5, wherein the top plate has a V-shaped longitudinal cross-sectional shape.

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